Use Python disk_usage for Windows storage metrics

Data/Agent/borealis-agent.py

@@ -17,6 +17,8 @@ import time  # Heartbeat timestamps
 import subprocess
 import getpass
 import datetime
+import shutil
+import string
 
 import requests
 try:
@@ -469,6 +471,24 @@ def collect_storage():
                     "used": usage.used,
                 })
         elif plat == "windows":
+            found = False
+            for letter in string.ascii_uppercase:
+                drive = f"{letter}:\\"
+                if os.path.exists(drive):
+                    try:
+                        usage = shutil.disk_usage(drive)
+                    except Exception:
+                        continue
+                    disks.append({
+                        "drive": drive,
+                        "disk_type": "Fixed Disk",
+                        "usage": (usage.used / usage.total * 100) if usage.total else 0,
+                        "total": usage.total,
+                        "free": usage.free,
+                        "used": usage.used,
+                    })
+                    found = True
+            if not found:
                 try:
                     out = subprocess.run(
                         ["wmic", "logicaldisk", "get", "DeviceID,Size,FreeSpace"],